生物基没食子酸环氧树脂/纳米氧化锌抗菌涂层的制备与性能EI北大核心CSCD

以没食子酸为主要原料制备生物基没食子酸环氧树脂(GAER),将硅烷偶联剂KH550表面改性的纳米ZnO与GAER进行复合,以丁二酸酐为固化剂,制备KH550-nano-ZnO/GAER生物基复合涂层。对纳米ZnO改性前后微观结构的变化进行表征;采用示差扫描量热仪对丁二酸酐/GAER体系的固化过程进行研究,测试KH550-nano-ZnO的加入对GAER固化膜力学性能、热性能、动态力学性能以及抗菌性能的影响。结果表明:适量KH550-nano-ZnO的加入,可以增加GAER固化体系的玻璃化温度,提高涂层表面的抗冲击性,KH550-nano-ZnO含量的增加使得涂层的硬度增加,附着力下降,热稳定性增加。复合涂层的起始热失重温度(T5%)比纯GAER高12.6~15.4℃。当KH550-nano-ZnO含量为2%(质量分数)时,玻璃化转变温度与纯GAER树脂相比增加了30.7℃。KH550-nano-ZnO/GAER固化涂膜对大肠杆菌和金黄色葡萄球菌的抗菌率均达到99.99%。

Preparation and properties of bio-based gallic epoxy resin/nano-ZnO antibacterial coating

Bio-based gallic acid epoxy resin(GAER)was prepared by gallic acid as main raw material. Nano-ZnO surface modification by KH-550 was used to prepare KH550-nano-ZnO. In addition, it was combined with the bio gallic acid epoxy resin(GAER), GAER/KH550-nano-ZnO composite coating was prepared by using succinic anhydride as curing agent. The changes of microstructure before and after modification of nano-ZnO were characterized. The curing process of succinic anhydride/GAER system was studied by differential scanning calorimeter. The effects of the KH550-nano-ZnO content on the mechanical properties, the thermal properties, dynamic mechanical properties and the antibacterial properties of the coating film were tested. The results show that the addition of proper amount of KH550-nano-ZnO can increase the glass transition temperature(Tg) of the system and improve the impact resistance of coating surface. The hardness and thermal stability of the coating are increased and the adhesion is decreased with the increased content of KH550-nano-ZnO. The initial thermal decomposition temperature(T5%) of the composite coating is higher 12.6-15.4 ℃ than that of pure GAER. When the content of KH550-nano-ZnO is 2%(mass fraction), the Tg is increased by 30.7 ℃ compared with pure GAER resin. The anti-bacterial rate of the KH550-nano-ZnO/GAER cured coating to Escherichia coli and Staphylococcus aureus reaches 99.99%.